Heated ring

1)the hole decreases in diameter
2)the area of the hole expands the same percent as any area of the aluminum
3)the area of the hole expands a greater percent than any area of the aluminum
4)linear expansion forces the shape of the hole to be slightly ellipitcal
5)the aluminum expands outward and the hole remains the same in size

Imagine the annulus as composes of many tiny radial rectangles. Consider what happens to all four edges of the rectangles. Consider what that means for the circumference of the hole. Translate that into an effect on the diameter and area of the hole.